Regulating device for motor-driven compressors.



nemen FREDERICK L. LUCKER, QF BRQKLYN, AND .[Lnll 0. CARPENTER, OFCGRNING, NEW YORK, SSIGNQRS TG INGERSOLlD-LND CGMFNY, OF JERSEY CETY,NEW JERSEY,

Application iie ecere'aer 27, 29512.

vices for compressors and more parifioularly to regulating devices ofshe ype w .ei-ein the mot-or is cut out at e predetermined maximumreceiver pressure and out in again when the receiver pressure falls to apredetermined minimum and wherein the compresser is unloaded so that themotor can start without difliculty.

In regulators of this type the motor circuit has heretofore beenprovided with resistance coils which are progressively cui; out asthemotor speeds up, by purely electrical means. This has necessitatedcomplicated and delicate systems of contacts and wiring which have heenat the same time fragile and expensive.

The chief object or" the. presentnvenl'ion is to eliminate far aspossible ele control of the starting oi the motor an stitute mechanismoperated inid sure, preferably from the receiver ehe compressor.

Si further object is to provide practical and comparatively simpleineens i trolling the unloading ot' the compres? bv the saine valvemechanism that operates the motor control, and also at the saine. timeto control the'-,oooiing wafer circulation 'of the compressor. A l

lilith these objects in 'view we have devised a regulating system apractical einhodirnent of which is shown in the accompanying drawings inwhich- Figure l shows diagrammatic view of the whole system and Fig. 2shows a detail ViewY of one of the resistance ccnrolling switches.

The system as shown in Fig. l comprises a compressor l driven by a motor2 charging into a receiver w j is supplied to the motor through leadwires #l and Lead wire 5 connects with a series Specceticn of Letterse'teniz.

latented elan. 255, i916.

no. resem.

of switches 5, 7, 8 and 9. here shown as iour in number. These switchesareV arranged to make Contact respectively with Contact. plaies lll. il,12 cessive points in a resistance coil or series of coils'lf., swiech 6in contact with plate l0 ehe 'lull resistance ci thecoil i4 in theniotor circuit. switches l and 8 successively less resistance. andswitch 9 giving direct connection with the motor. These switches may beconstructed as shown in Fig. 2 and comprise a hell crank lever havinglonger arm l5. which is the Contact arm, ed a shorter arin 16, which isthe operating arm, the whole being pivotally mounted on a pin 17,secured in a supporting;- nog i8. These switches are ooeratedby fluidactuated motors i9, 2G, *2l and 22 each of which comprises a cylinder 23in which slides a piston 2li provided with a connecting rod 95 which isnivotallv connected bv a pin 26 to the switch operating arm 16. A.spring 27 in the cylinder 23 normally keeps the piston 24 end holds theswitch in open position. To the motors il), 20.21 and 22 fluid supplyducts 28, 29. 3G and 3l lead from ports 32, 3B. and in a valve chestwhich is in the iorni oi' a cylinder'having portions of la rger andsmaller diameters. Sliding the valve chest is a valve 3l which consistsof two portions, one sliding in the larger diameter part. of the valvechest and the other in the snialler diameter part. The larger diameterport-ion oi the valve 37 is in the forni oi a spool with two heads 38and 39. The head is provided with a peripheral pori -lfO which isconnectedby a transverse passage Lil and longitudinal passage l2 withthe valve chest at the farther end ofthe spool.

From the intermediate part of the larger portion of the valve chest 35 apassage 42 leads to the atmosphere and is in constant communication withthe. annular chamber ormed hy the shank of the valve 3?. From the largerend of the valve chest a passage 43 leads to a second valve chest 44.vValve chest se also has cylindrical bore of two diameters inwhichsiirles a valve 4:5 having a smaller dialnet-er head LlG- and alarger diameter head e?. From the smaller diameer portion of the valve.chest a fluid duct #i8 leads to the receiver. From the and 13 connectingwith sncf.

eol

' r presser here central part of the valve chest 44 a passage 49'leadsto the atmosphere the size of its outlet being controlled by aneedle valve 50 adjustably threaded into the valve chest. From thelarger diameter end ofthe valve chest 44 a ipe 5l leads to an auxiliarycontrolling va vve 52. This valve 52 is connected to the receiver bypipes 53 and 5 4 and its construction forms no part of the presentinvention being 'fully described in the c0- pending application of W.`f`.V Treiber and E. L. Bullrley, No. 703,644, liled June 14th,

'- 1912. It is suicient to say-here that its construction is such that'at u predetermined maximum pressure 1n the leceiver 1t oper-' lates topermit fluid at receiver pressure to enter the pipe 51 and when thereceiver pressure falls to a predetermined minimum it opens the'pipe 51to atmosphere through the exhaust opening 55.

Referring again to the valve 37 its smaller diameter pori lon consistsof a rod 56 secured to the head 39.; rod 56 having on its outer end ahead 57 fitting the smaller diameter portionof the valve chest. From theinner end of the smaller diameter portion a port 58 leads to theatmosphere while from the outer end a pipe 59 leads to' a valve 60'which controls the speed of movement of the valve 37. This valve G0comprises a valve chest 6l from the lower end oi which a pipe 62 leadsto the receiver. Surrounding the opening around the pine 62 is abeveledvalve :seat` 63 against which seat-s a check valve 64 which is heldtoits seat hy a spring 65, the air oe ing thus afforded freefpassage inone direction, that is,` from the receiver to the mpc .39

leading into the valve chest A restricted kpassage ttor the air in the'other ldirection is provided by a needle valve 66 which seats in' abeveled openingl GY in the valve. 64 and is adjustably threaded in thevalve. From a point in the smaller diameter 'portion of the valve chest`36 intermediate between the ab mospheric port 5S and the inlet pipe 59a pipe 68 lcadsto an unloader for the com shown diagrannnatically-as avaive 69 actuated by a piston 70 to open the discharge line 7l ofthecompressor toatmosplierevwhen pressure is admitted to the .Acv checkvalve 7-1 prevent-s the escape of fluid from the 'receiver-'3,

The cylinder of the compressor rounded by a water Ajacket here shown asa coil 72 into which Water is introduced through an inlet valve 73. Thisinlet valve is controlled by a piston i-4 sliding in a cylinder 75 thepiston being moved in one direction tofopen the valve by a spring 76 andin the other direction by fluid pressure' conveyed through the pipe 77.from the anic iliary valve y Referring again to the motor control, oneor more of the switches 6, 7, 8 and 9 (here shown only asY switch 9) isprovided with a' "nectcd from the receiver pressure incasso magneticlatch for 4holding it in closed poid tion. This is shown in Fig. 2 andconsists of a latch 78 on the arm l5 "which is adapted to be engaged bythe hoek of a latch liar pivoted near its center on a pin SG. i spring8l secured to the other end of the latch bar'tends to disengage thelatch har from the switch while .a magnet 82 is prf vided to hold it inengagement with the switchwhile current is passing through the magnetcoil. @ne terminal cf the magnet coil is connected. to the lead wire elwhile the other is connected to the lead wire through 'a luirl operatedswitch 83, Tliris switch consists of a cylinder 84 in which slides a.'piston 85 provided with a rod 86 the ngi-per end ot" which is securedto the switch l 'il which is adapted to connect tif/'c conta. s and 32connected respectively with the andwith the lead aire ihrongh the megnet32. The piston is held 'ncrreally in its lowermost positicn springconne-c tion thus being mada between 'the e and S9 and current oassedthrongh net S2, holding the switch 'in classe posi tion. From the lowerend o?? the 84 a pipe @l leads to the auxiliary more and is adapted'toconvey ii'zid under pres 'In operation, when the in the re ceu/'erreaches a pressure which is deterlnmcd bythe adgustmen', el the a: l

receiver pressure to the pipe 5l. This pipe is connected with .thelarger diameter igortion of the valve chest il Whilethe other end of thefaire chest 44 lilies-isc in communication' with the receiver throughthe pipe 48. As the .heed .47 of the valse 45 is Alarger than the l;more upwardly, is the port 43 the valve chest 3i;

s -ne disconin pipe 48 and connectedto the atnnisphere 'ongle the port49. is there is' constant receiver pressure in the arther end of thevalve chest. ori-thc smaller diameter head 57 the v'alvel? will move tothe left. This Will allow receiver pressure'to intothe pipe GS andV openthe discharge line valve ill of the compressor to atmosgiherethrough thevaction of the receiver pressure .catho piston 70. By theoperationdfauxiliary valve 52 fluid under pressire isA also admitted under thepiston 8-5 moving it upwardly and breaking-the contact connectionbetween the contacts 88 and 89' and hence. (lecher-rising the magnet S2.This allows the springu 8l to release they latch bar I9 from its' engagewill he ele'- yes.

Wire e .cel-er A laryvvalve 52 this valve will operate ad nttingj l A''i Valve will' nient with the switch 9 and allows the' serves in Conwayjessm'e :n dose the Swich 1s open 'i h ,mwa Aga S.. mrougn L e pm L mlnavmg startled to mmv acti-1m 0f the aux als@ a ,o CVV fallen te aWmmuand the coong regulations nke :y ausl?.

T'vheu by Ta the csmpl-essoy justmen# of m 511km' he switch. 87 again tomake Connection with she conacis 3Q mii s 1 to 'Sow thyough h@ c tem.The pressme the lower pari;- o

the head 46 of he mh' 48 valve mil moife c receiver valve cheg U6, iniat ik@ extrme t (ai ns it Inf/ves is mth the pmt 3' 'Hu-lf?, Wifi neadmitted hx'uugh ik@ passge $2, L Li() into the pipe lending to 'hemfr-tor 9. This will move Cw 'pistou :'24v of this motor upehe e monaWudly forcing 'the sich commi 1G und :mance-img; i. with im fulllessanse ,of its @i NICE ihk' port sh wing' and description discloses@Bly alla specsd modicaion of he invention and @they and mn'catons aendude 4in the Sp' Q @she invention as on? a uomprassfo, its re y {rsvqth@ compresso? 01" @ne @param ated Switch com-EOL l, a ud actuated jegand auxiliary valve which said fluid ducts ychest for serially admittingfluid to said ceiver, a motor for I mechanism for yerating arcas,

from the smaller surface to vary era-ting said switch sistance, ioperating said switches, a fluid operated uniluid actuated loader forthe compressor, a

valve having one portion serving to admit fluid pressure progressivelyto said switch motors and another portion serving to control saidunloader and means to admit iluid pressure to actuate said valve atprede-` termined receiver pressures.

1i. In combination, a compressor, its redriving the compressor, themotor circuit, switch cutting in the motor and `said resistance, fluidactuated motor mechanism for actuating said switch mechanism, a fluidoperated unloader, for the compressor, a vfluid actuated controllingvalve having one portion serving to supply iluid progressively .to saidmotormechanism, and another' portion serving to operate said unloader, ailuid operated switch for cutting out said motor and auxiliary valvemechanism for actuating said controlling valve resistance in and saidiluid actuated switch at prede termined receiver pressures.

5. In combination, ceiver, a motor for resista-nce in the motor circuit,a series of switches for cutting in the motor and decreasing saidresistance, fluid actuated motors torV operating said'switches, fluidducts to said motors, a valve chest from lead, a valve in said acompressor, its remotors, said valve having diierentialA opmeans toadmit receiver pressure constantly. to the smaller operating surface,means Ioperating 'at predetermined receiver pressures to'expose theother surface to receiver pressure to' operate the valve, and .to theatmosphere'to restore it to position, and means to vary the exhaust lthespeed of. valve movement.

6. In combination, a compressor, its receiver, a motor for driving saidcompresser, resistance in the motor circuit, a for cutting out saidmotor, an unloader for said compressor, means for opand unloader at a.pren determined maximum receiver pressure' switchA mechanism forprogressivelyv cutting in said motor circuit, iuid actuated motormechanism for actuating said switch mechanism, said motor mechanismoeing adapted mechanism und 'throwing on at a predetermined minimumreceiver pres* sure. y I y 7. lnv combination, a compressor, itsredriving the compressor,

- motors for closing said switch mechanism from no' ceiver, a 'motorordriving the compressor, resistance in the motor circuit, a series oswitches for cutting in the motor and pro-y gressively cutting out saidresistance, ilui` actuated motors for actuating said switches, a fluidactuated sliding valve for successively admitting pressure to said,switch motors, means for admitting fluid pressure 4to actuate said valveat a' predetermined minimum receiver pressure, and means to vary thespeed of said valve;

S. In combination, a compressor, its re ceiver, a 4motor fordriving'said compressor, resistance in the motor circuit, switchmechanism for progressively varying' said resistance,. luidl actuatedmotor mechanism for actuating said switch mechanism, sai motor mechanism'being adapted to operate said switch mechanism from no load to fullload at constan iluid pres'silrlt, and means for admitting fluid to saidswitch. motor mechanism vat a predetermined pressure' in said receiver.

9. In combination, a. ompressor, a receiver, a motor for' driving saidcompressor, resistance in the' motor circuit, a ,series of .switches forprogressively varying ysaid reinfr motor., resistance in mot-or circuit,a

series of switches for varying said resistance, fluid operated motorsL'for actuating said switches, means for serially introducing motiveiluid into,` and exhausting said motors,

a magnetically controlled latch for locking 'A one of said switches inclosed position, an

means orreleasing said latch at a predetermined fluid pressure.

il. In a fluid ope mechanism, a motor circuit, resistance insuid'circuit, a, series of sivitchesor progressively cutting out saidresistance, iluid motors for closing said switches, pressure operatedvalve mechanism for serially com -nesting said motors with ay source or"duid pressure, and auxiliary valve mechanism .to

iadmit luid pressure to operate said motor valve mechanism. 'f 1Q. In afluid operated motor starting mechanism, a motor circuit, resistance insaid circuit, a. series of switches for progressively cutting out saidresistance, fluid said switches, pressure operated valve mechanism forserially. con-- necting said motors with 'a source of fluid pressure,auxiliary valve mechanism to admit fluid pressure y valve mechanism, andthe speed of said motor valve meclfianivi3. In a duid operated motorster ated motor starting Lio to oper'ate'said motor. f ,means for'regula i g;

